CA1307162C - Anti-wrap up device for web fed printing presses - Google Patents
Anti-wrap up device for web fed printing pressesInfo
- Publication number
- CA1307162C CA1307162C CA000566701A CA566701A CA1307162C CA 1307162 C CA1307162 C CA 1307162C CA 000566701 A CA000566701 A CA 000566701A CA 566701 A CA566701 A CA 566701A CA 1307162 C CA1307162 C CA 1307162C
- Authority
- CA
- Canada
- Prior art keywords
- web
- rollers
- gripping rings
- gripping
- frame means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/18—Web break detection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2233/00—Arrangements for the operation of printing presses
- B41P2233/20—Safety devices preventing damage
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Rotary Presses (AREA)
Abstract
ABSTRACT
An apparatus for protecting the printing units of a web fed press from damage in the event of a web break after it leaves the press, The apparatus comprising: frame means, and free turning rotational inertia means including means journaled in the frame means for rotation in cooperative opposition with respect to each other and in constant contact with the traveling web to be driven thereby so that web will continue to be removed from the press by the inertia means in the event of a web break down stream therefrom.
An apparatus for protecting the printing units of a web fed press from damage in the event of a web break after it leaves the press, The apparatus comprising: frame means, and free turning rotational inertia means including means journaled in the frame means for rotation in cooperative opposition with respect to each other and in constant contact with the traveling web to be driven thereby so that web will continue to be removed from the press by the inertia means in the event of a web break down stream therefrom.
Description
ANTI-WRAP UP DEVICE FOR WEB FED PRINTING PRESSES
This invention relates to an apparatus for protecting the prlnting unit of a web fed printing press, usually the printing cylinders, against damage that can be caused by paper wrapping around on the blanket cylinder when there is a break in the web after it has left the printing unit. Generally, the apparatus comprises free turning rotational inertia means that cooperate in gripping the web between them and which are driven by the web so that they continue to draw the web forwardly when there is a web break downstream of the apparatus.
Background of the_Invention Prior Art-In the production of printed web materials, as for example through the use of a web fed offset printing press, it is known that the web leaving the last printing unit carries ink which is not yet dry and it is further known that the web after leavin~ the press is often subject to rupture or breakage. When such breakage occurs, ~t is the normal occurrence that the broken end of the web will wrap around one of the rolls of the last printing unit, usually the ~L3~7~
blanket roll, and cause damage. Even if no damage results from the web wrapping around the blanket cylinder, it is difficult and time consuming to remove the wrapped around web from the press. Therefore, it has been known in the prior art to provide apparatus which is designed to prevent a broken web from wrapping around cylinders that are contained in the printing unit 1tself. In most of the prior art the web carrying wet ink passes between a pair of spaced apart rolls, so that the ink is not smeared, which rolls are designed to move together when a sensor detects a break in the web. Typical of this form of apparatus are those described in U.S. Patent 4,549,485 and in Br1tish Patent 1408176. In U.S. Patent 4,549,485 there are provided a pair of opposed gripping rollers 3 and 15 which are spaced apart during normal operat1On of the press but which can be moved into contacting relationship with the web when the web 1s ruptured. The movement of the rolls toward each other 1s effected when a suitable sensor such as a web tension sensor, detects that the ~eb has been broken. A somewhat similar arrangement is described in the British Patent which was noted above. In both the U.S. patent and Tn the Brit1sh patent the rolls that grip the web are driven by some suitable outside dr1ving apparatus.
In another type of apparatus, specif1cally that described in U.S. patent 4508033, there are prov1ded a pair of opposed rolls 14 and 15 which are rubber covered and are in constant contact with the traveling web. In th1s case the rolls are dr1ven at a peripheral speed which is slightly greater than the llnear speed of the printed web so as to maintain tension on the web that is ex1ting from the printing press.
~3~7~b~
It has been determined that whlle apparatus of the type re~erred to above are somewhat effective they still are not totally effective because on the one hand the reaction to grip a broken end depends upon senslng that the web has already been broken so that the gripping rolls do not always advance the web coming from the press in a reliable fashion. In addition, all of the rolls are driven so that speed adjustments must constantly be maintained to insure that there is uniformity of rotational speed of the gripping elements and the linear speed of the web to maintaln proper tension. In addition, where the rolls are in total contact with the traveling web there is the problem of smearing or otherwise disturbing the ink that has been printed on the travellng web.
Summary of the Inventlon It is therefore a principal object of this lnvention to provide an improved capturing device for continuously withdrawing printed web from the last prlnting stand when a rupture has occurred downstream from the capturing apparatus.
It is a further object of this invention to provide an anti-wrap up device in which the gripping element are driven by the web so that the speed is identical to that of the traveling web.
An additlonal object of this lnvention is to provide an antl-wrap up devlce in whlch laterally adjustable gripping rlngs are provided that permit the travellng web to be gripped in pre-selected positions in non print areas.
;i, _ 3 _ B
'7~
In accordance with an embodiment o~ the invention, in an offset lithographic printiny press haviny support frame apparatus, a printiny couple comprised of a blanket cylinder and an impression cylinder mounted on the frame apparatus web capturing apparatus mounted on the frame apparatus, downstream of the printing couple *or protecting the printing couple from damage in the event of web breakage after it exits the printing couple, the capturing apparatus comprised of a pair of web capturing inertial rollers between which the web passes, each of the rollers having a plurality of circular web gripping rings mounted thereon for contact with the traveling web, bearing apparatus freely rotatably supporting the rollers on the support frame apparatus with the gripping rings in normal constant contact with the web so that the rollers are rotatably driven sol~ly by the web, throw-out apparatus operatively associated with the bearing apparatus supporting one of the inertial rollers whereby the bearing apparatus can be moved to a position at which the gripping rings of the one supported roller are not in contact with the web, and apparatus providing adjustment of the gripping rings laterally along the axis of rotation of the inertial rollers for positioning the gripping rings in the margins between printed columns on the web.
Other and additional objects of this invention will be in part obvious and in part explained by reference to the accompanying specification and drawings in which:
- 3a -Fig 1 is a side elevation of the anti-wrap up device of this inventlon showing cooperating free turning rotational inertia means mounted as they engage the traveling web; and Fig. 2 is a front elevation of a portion of the anti-wrap up device of Figure 1 showing the manner in which the free turning rotational inertia means are journaled in the ~rame and showing the manner in which the gripping means contact the traveling web.
Description of the Preferred Embodiment Referring to Fig. 1 of the drawings, there is shown a horizontally disposed traveling web 10 that passes between a pair of free turning rotational inertia means 11 and 12, hereshown as a pair of opposed rollers.
It should be pointed out that although rollers are shown here as one embodiment it should be pointed out that any other inertial gripping means such as trolleys or wheels etc. may be used. The important thing is that the inertia means be in constant contact with traveling web 10 and be of sufficient mass as to provide continued rotation and contact with the web in the event of a web break downstream from the gripping apparatus.
The rollers or inertia means 11 and 12 are shown as being journaled in frame 15 b~ means of stub shafts 16 and 17 that are disposed within bearings 18 and 19 respectively. As can be seen most clearly in Fig. 2 of the drawings, a throw out mechanism 20 is provided for moving the upper roll 11 toward and away from the lower roll 12 to provide for disengagement when desired.
~3~t7~
Since the ink on traveling web 10 is wet when it enters the nip between the inertia means or rollers 11 and 12, the apparatus of this invention provides gripper means 25 which take the form Gf rings that are disposed about the periphery of the inertia means 11 and 12. The gripping rings 25 may be secured to the rolls 11 and 12 by means of set screws or other fastening means so that they may be loosened and adjusted laterally along the length of the axis of the rollers 11 and 12. This is done in order that the rings can be placed in the non-printed areas which exist between printed columns on the web. In this manner the possibility of smearing or smudging or otherwise disturbing the freshly printed matter is eliminated.
In operation, the throw out mechanism is used to move the roll 11 away from roll 12 as the web 10 is threaded through and on into subsequent processing apparatus such as a dryer or the like. The throw out mechanism then lowers the roll 11 into contact with the web as illustrated in Figure 2 and the printing operation is initiated. It is obvious that as the web is drawn between the inertia means or rollers 11 and 12, it causes the rollers to rotate at exactly the same speed as the traveling web. In the event of a web break after the capturing or anti-wrap up device the inertial movement of the tvo opposing inertia means 11 and 12 will continue to draw web through the nip between them and prevent any wrap up about the printing rolls in the last printing unit. This device then does not require a signal to activate its capturing function, since the inertia of the device wants to continue to rotate even if the web is broken and wants to go slack. Therefore, it does not experience a delay and keeps the web in tension back to the printing unit. The loose end of the web is then accumulated past the anti-wrap up device (in a location that wi11 not cause damage and is easy to clean~.
This invention relates to an apparatus for protecting the prlnting unit of a web fed printing press, usually the printing cylinders, against damage that can be caused by paper wrapping around on the blanket cylinder when there is a break in the web after it has left the printing unit. Generally, the apparatus comprises free turning rotational inertia means that cooperate in gripping the web between them and which are driven by the web so that they continue to draw the web forwardly when there is a web break downstream of the apparatus.
Background of the_Invention Prior Art-In the production of printed web materials, as for example through the use of a web fed offset printing press, it is known that the web leaving the last printing unit carries ink which is not yet dry and it is further known that the web after leavin~ the press is often subject to rupture or breakage. When such breakage occurs, ~t is the normal occurrence that the broken end of the web will wrap around one of the rolls of the last printing unit, usually the ~L3~7~
blanket roll, and cause damage. Even if no damage results from the web wrapping around the blanket cylinder, it is difficult and time consuming to remove the wrapped around web from the press. Therefore, it has been known in the prior art to provide apparatus which is designed to prevent a broken web from wrapping around cylinders that are contained in the printing unit 1tself. In most of the prior art the web carrying wet ink passes between a pair of spaced apart rolls, so that the ink is not smeared, which rolls are designed to move together when a sensor detects a break in the web. Typical of this form of apparatus are those described in U.S. Patent 4,549,485 and in Br1tish Patent 1408176. In U.S. Patent 4,549,485 there are provided a pair of opposed gripping rollers 3 and 15 which are spaced apart during normal operat1On of the press but which can be moved into contacting relationship with the web when the web 1s ruptured. The movement of the rolls toward each other 1s effected when a suitable sensor such as a web tension sensor, detects that the ~eb has been broken. A somewhat similar arrangement is described in the British Patent which was noted above. In both the U.S. patent and Tn the Brit1sh patent the rolls that grip the web are driven by some suitable outside dr1ving apparatus.
In another type of apparatus, specif1cally that described in U.S. patent 4508033, there are prov1ded a pair of opposed rolls 14 and 15 which are rubber covered and are in constant contact with the traveling web. In th1s case the rolls are dr1ven at a peripheral speed which is slightly greater than the llnear speed of the printed web so as to maintain tension on the web that is ex1ting from the printing press.
~3~7~b~
It has been determined that whlle apparatus of the type re~erred to above are somewhat effective they still are not totally effective because on the one hand the reaction to grip a broken end depends upon senslng that the web has already been broken so that the gripping rolls do not always advance the web coming from the press in a reliable fashion. In addition, all of the rolls are driven so that speed adjustments must constantly be maintained to insure that there is uniformity of rotational speed of the gripping elements and the linear speed of the web to maintaln proper tension. In addition, where the rolls are in total contact with the traveling web there is the problem of smearing or otherwise disturbing the ink that has been printed on the travellng web.
Summary of the Inventlon It is therefore a principal object of this lnvention to provide an improved capturing device for continuously withdrawing printed web from the last prlnting stand when a rupture has occurred downstream from the capturing apparatus.
It is a further object of this invention to provide an anti-wrap up device in which the gripping element are driven by the web so that the speed is identical to that of the traveling web.
An additlonal object of this lnvention is to provide an antl-wrap up devlce in whlch laterally adjustable gripping rlngs are provided that permit the travellng web to be gripped in pre-selected positions in non print areas.
;i, _ 3 _ B
'7~
In accordance with an embodiment o~ the invention, in an offset lithographic printiny press haviny support frame apparatus, a printiny couple comprised of a blanket cylinder and an impression cylinder mounted on the frame apparatus web capturing apparatus mounted on the frame apparatus, downstream of the printing couple *or protecting the printing couple from damage in the event of web breakage after it exits the printing couple, the capturing apparatus comprised of a pair of web capturing inertial rollers between which the web passes, each of the rollers having a plurality of circular web gripping rings mounted thereon for contact with the traveling web, bearing apparatus freely rotatably supporting the rollers on the support frame apparatus with the gripping rings in normal constant contact with the web so that the rollers are rotatably driven sol~ly by the web, throw-out apparatus operatively associated with the bearing apparatus supporting one of the inertial rollers whereby the bearing apparatus can be moved to a position at which the gripping rings of the one supported roller are not in contact with the web, and apparatus providing adjustment of the gripping rings laterally along the axis of rotation of the inertial rollers for positioning the gripping rings in the margins between printed columns on the web.
Other and additional objects of this invention will be in part obvious and in part explained by reference to the accompanying specification and drawings in which:
- 3a -Fig 1 is a side elevation of the anti-wrap up device of this inventlon showing cooperating free turning rotational inertia means mounted as they engage the traveling web; and Fig. 2 is a front elevation of a portion of the anti-wrap up device of Figure 1 showing the manner in which the free turning rotational inertia means are journaled in the ~rame and showing the manner in which the gripping means contact the traveling web.
Description of the Preferred Embodiment Referring to Fig. 1 of the drawings, there is shown a horizontally disposed traveling web 10 that passes between a pair of free turning rotational inertia means 11 and 12, hereshown as a pair of opposed rollers.
It should be pointed out that although rollers are shown here as one embodiment it should be pointed out that any other inertial gripping means such as trolleys or wheels etc. may be used. The important thing is that the inertia means be in constant contact with traveling web 10 and be of sufficient mass as to provide continued rotation and contact with the web in the event of a web break downstream from the gripping apparatus.
The rollers or inertia means 11 and 12 are shown as being journaled in frame 15 b~ means of stub shafts 16 and 17 that are disposed within bearings 18 and 19 respectively. As can be seen most clearly in Fig. 2 of the drawings, a throw out mechanism 20 is provided for moving the upper roll 11 toward and away from the lower roll 12 to provide for disengagement when desired.
~3~t7~
Since the ink on traveling web 10 is wet when it enters the nip between the inertia means or rollers 11 and 12, the apparatus of this invention provides gripper means 25 which take the form Gf rings that are disposed about the periphery of the inertia means 11 and 12. The gripping rings 25 may be secured to the rolls 11 and 12 by means of set screws or other fastening means so that they may be loosened and adjusted laterally along the length of the axis of the rollers 11 and 12. This is done in order that the rings can be placed in the non-printed areas which exist between printed columns on the web. In this manner the possibility of smearing or smudging or otherwise disturbing the freshly printed matter is eliminated.
In operation, the throw out mechanism is used to move the roll 11 away from roll 12 as the web 10 is threaded through and on into subsequent processing apparatus such as a dryer or the like. The throw out mechanism then lowers the roll 11 into contact with the web as illustrated in Figure 2 and the printing operation is initiated. It is obvious that as the web is drawn between the inertia means or rollers 11 and 12, it causes the rollers to rotate at exactly the same speed as the traveling web. In the event of a web break after the capturing or anti-wrap up device the inertial movement of the tvo opposing inertia means 11 and 12 will continue to draw web through the nip between them and prevent any wrap up about the printing rolls in the last printing unit. This device then does not require a signal to activate its capturing function, since the inertia of the device wants to continue to rotate even if the web is broken and wants to go slack. Therefore, it does not experience a delay and keeps the web in tension back to the printing unit. The loose end of the web is then accumulated past the anti-wrap up device (in a location that wi11 not cause damage and is easy to clean~.
Claims
1. In an offset lithographic printing press having support frame means, a printing couple comprised of a blanket cylinder and an impression cylinder mounted on said frame means, web capturing apparatus mounted on said frame means, downstream of said printing couple for protecting the printing couple from damage in the event of web breakage after it exits the printing couple, said capturing apparatus comprising:
(a) a pair of web capturing inertial rollers between which the web passes, each of said rollers having a plurality of circular web gripping rings mounted thereon for contact with the traveling web;
(b) bearing means freely rotatably supporting said rollers on said support frame means with said gripping rings in normal constant contact with the web so that the rollers are rotatably driven solely by the web;
(c) throw-out means operatively associated with the bearing means supporting one of said inertial rollers whereby said bearing means can be moved to a position at which the gripping rings of the one supported roller are not in contact with the web; and (d) means providing adjustment of said gripping rings laterally along the axis of rotation of said inertial rollers for positioning said gripping rings in the margins between printed columns on the web.
(a) a pair of web capturing inertial rollers between which the web passes, each of said rollers having a plurality of circular web gripping rings mounted thereon for contact with the traveling web;
(b) bearing means freely rotatably supporting said rollers on said support frame means with said gripping rings in normal constant contact with the web so that the rollers are rotatably driven solely by the web;
(c) throw-out means operatively associated with the bearing means supporting one of said inertial rollers whereby said bearing means can be moved to a position at which the gripping rings of the one supported roller are not in contact with the web; and (d) means providing adjustment of said gripping rings laterally along the axis of rotation of said inertial rollers for positioning said gripping rings in the margins between printed columns on the web.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US5469987A | 1987-05-27 | 1987-05-27 | |
| US54,699 | 1987-05-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1307162C true CA1307162C (en) | 1992-09-08 |
Family
ID=21992919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000566701A Expired - Lifetime CA1307162C (en) | 1987-05-27 | 1988-05-13 | Anti-wrap up device for web fed printing presses |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0292645B1 (en) |
| JP (1) | JP2825491B2 (en) |
| AU (1) | AU600554B2 (en) |
| CA (1) | CA1307162C (en) |
| DE (2) | DE3881761T2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4201481A1 (en) * | 1992-01-21 | 1993-07-22 | Heidelberger Druckmasch Ag | DEVICE FOR HANDLING MATERIAL COATINGS IN PROCESSING MACHINES |
| US5678484A (en) * | 1993-03-25 | 1997-10-21 | Baldwin Web Controls | Anti-wrap device for a web press |
| US6298782B1 (en) | 1993-03-25 | 2001-10-09 | Baldwin Web Controls | Anti-wrap device for a web press |
| US5398610A (en) * | 1993-03-25 | 1995-03-21 | Baldwin Web Controls | Anti-wrap device for a web press |
| DE19518502C2 (en) * | 1995-05-19 | 1997-10-02 | Wifag Maschf | Retaining device for a web running in a web-fed rotary printing press |
| DE19645799A1 (en) * | 1996-11-07 | 1998-05-20 | Roland Man Druckmasch | Paper web catcher |
| DE102004014777B4 (en) * | 2004-03-26 | 2014-04-10 | Baldwin Germany Gmbh | Web catching device of a web-fed rotary printing press |
| CN106965539A (en) * | 2017-04-21 | 2017-07-21 | 东莞市长和兴印刷机械有限公司 | A kind of printing machine breaks line apparatus |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE628879C (en) * | 1934-06-02 | 1936-04-18 | Fallert & Co A G | Paper web guide |
| DE941127C (en) * | 1953-04-18 | 1956-04-05 | Hinniger Automatic Druckmasch | Draw roller arrangement on a printing machine for variable formats |
| DE1911297A1 (en) * | 1969-03-06 | 1970-09-24 | Albert Schnellpressen | Device on rotary printing machines for holding the paper web |
| JPS5018562U (en) * | 1973-06-14 | 1975-03-01 | ||
| DE3215473C2 (en) * | 1982-04-24 | 1985-03-07 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Device for preventing printing unit damage in the event of print carrier web breaks |
| JPS6112342A (en) * | 1984-06-29 | 1986-01-20 | Toppan Printing Co Ltd | Apparatus for inspecting printed matter |
-
1988
- 1988-02-18 DE DE19883881761 patent/DE3881761T2/en not_active Expired - Fee Related
- 1988-02-18 EP EP19880102365 patent/EP0292645B1/en not_active Expired - Lifetime
- 1988-02-18 DE DE1988102365 patent/DE292645T1/en active Pending
- 1988-02-23 AU AU12068/88A patent/AU600554B2/en not_active Ceased
- 1988-04-18 JP JP63095370A patent/JP2825491B2/en not_active Expired - Lifetime
- 1988-05-13 CA CA000566701A patent/CA1307162C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE3881761T2 (en) | 1993-11-11 |
| EP0292645A3 (en) | 1990-03-07 |
| AU1206888A (en) | 1988-12-01 |
| EP0292645B1 (en) | 1993-06-16 |
| DE3881761D1 (en) | 1993-07-22 |
| AU600554B2 (en) | 1990-08-16 |
| DE292645T1 (en) | 1989-04-20 |
| EP0292645A2 (en) | 1988-11-30 |
| JPS63306044A (en) | 1988-12-14 |
| JP2825491B2 (en) | 1998-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
Effective date: 20121205 |